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Operational Characteristics and Performance of Centrifugal fans.

Author : Date : 2016-7-27 11:34:21

Operational Characteristics and Performance of Centrifugal fans. 


Re.Centrifugal fans, The three types of centrifugal fan blades (radial, backward and forward) give three characteristic performances. And present the typical characteristic curves for radial, backward and forward bladed fans respectively. Exact performance for a given fan can only be obtained on test. a. Radial blade This type of blade is usually used for handling suspended materials, abrasive dust collecting and exhausting of pumps from dirty, greasy or acid environment.
 
The rather sharply rising static pressure curve of the radial blade centrifugal fan allows for small changes in volume as the resistance of the system changes considerably. A Fair running static efficiency is 50-70 percent for both the straight radial blade and radial tip blade. b. Backward blade This type of blade is well suited to stream line conditions and is used extensively on ventilating, air conditioning and clean and dirty process gas streams. The outstanding and important characteristic is the nonoverloading power (kilowatts). It eliminates the need for oversized motors or other drivers. The usual operating static efficiency range for the regular blade is 65-80 percent and for the streamlined design is 80-92 percent. c. Forward blade This type is usually shallow and operates at slow speed for a given capacity and usually has low outlet velocity. Its operating characteristics are poor for many applications, since the power rises sharply with a decrease in static pressure once the peak pressure for the fan has been reached. The operating static efficiency range is 55-75 percent.